First, the calculation conditions
Distribution voltage U e=220V
The design socket circuit adopts BV-2*.5 wire, BVR-1*2.5PE;
Check the table: RO = 8.7 ohm / KM; XO = 0.127 / KM;
The maximum distribution distance in the design plane is 50 meters, so the other circuit L=100 meters, the circuit breaker is C65 type distribution type circuit breaker, and the contact resistance RZ=1.3 milliohms;
Second, the calculation formula
Id=Ue/ZxI∑
Where Ue is the rated loop voltage and ZxI∑ is the total loop impedance
Third, protection calculation
1) Calculate ZxI∑
ZxI∑= √ (0.0013+100*0.0087)^2+(100*0.000127 ^2)
=√ 0.759+0.00016
=0.871 (Europe)
2) Calculate single-phase ground fault current Id (TN system)
Id=Ue/ZxI∑=220/0.871=253(A)
3) Checking
According to Schneider C65 miniature circuit breaker type 2 curve (distribution type), when the short-circuit current is 4-7 times of the rated current of the circuit breaker, it will act instantaneously.
The socket circuit breakers used in the design are all 065-10A/1P, ie Ie=10A;
Therefore, the single-phase ground fault current action multiple is m=Id/Ie=253/10=25.3 (times) to ensure instantaneous action, and the trip time is t=0.02 second, which fully meets the requirements of the specification.
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